Power module assembly

A power module assembly comprising:

• a circuit board comprising at least one plane;
• at least one heat-generating device disposed on the at least one plane;
• at least one first metal block comprising a first side and a second side, wherein the first side of the first metal block faces the at least one heat-generating device, and the second side of the first metal block faces a substrate, wherein each one of the at least one first metal block substantially thermally contacts a corresponding one of the at least one heat-generating device, wherein a projection of each one of the at least one first metal block on the at least one plane overlaps a projection of the corresponding heat-generating device on the at least one plane, and does not overlap a projection of another heat-generating device on the at least one plane;
• a first filling material disposed between the first side of the first metal block and the at least one heat-generating device, and
• a second metal block comprising a first end and a second end, wherein the first end is connected to the at least one plane, the second end is flat and coplanar with the second side of the first metal block, and configured to connect to an installation plane of the substrate.